At the beginning of 1944 Heinkel was persuaded to start
work on a new four engined jet powered bomber using a 1.5 enlargement
of the Ar 234 as a basis.

By 14/3/1944 the planes were submitted to the RLM and
given the designation He 343. The RLM order 20 aircraft and work started
on the V1 prototype soon after.

A line drawing showing the
lay out of the He 343

But in November 1944 the whole
program was stopped, in favour of the Junkers Ju 287. All finished components
and jigs were put into storage, it is thought however that the V1 was completed
by Heinkel and tested regardless.